Authentication-Results Registration for Differentiating among Cryptographic Results
RFC 6008
| Document | Type |
RFC - Proposed Standard
(September 2010; No errata)
Was draft-kucherawy-authres-header-b (individual in app area)
|
|
|---|---|---|---|
| Last updated | 2015-10-14 | ||
| Stream | IETF | ||
| Formats | plain text pdf html bibtex | ||
| Stream | WG state | (None) | |
| Document shepherd | No shepherd assigned | ||
| IESG | IESG state | RFC 6008 (Proposed Standard) | |
| Consensus Boilerplate | Unknown | ||
| Telechat date | |||
| Responsible AD | Alexey Melnikov | ||
| Send notices to | barryleiba@computer.org | ||
Internet Engineering Task Force (IETF) M. Kucherawy
Request for Comments: 6008 Cloudmark, Inc.
Category: Standards Track September 2010
ISSN: 2070-1721
Authentication-Results Registration for Differentiating
among Cryptographic Results
Abstract
This memo updates the registry of properties in Authentication-
Results: message header fields to allow a multiple-result report to
distinguish among one or more cryptographic signatures on a message,
thus associating specific results with the signatures they represent.
Status of This Memo
This is an Internet Standards Track document.
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Further information on
Internet Standards is available in Section 2 of RFC 5741.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
http://www.rfc-editor.org/info/rfc6008.
Copyright Notice
Copyright (c) 2010 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with respect
to this document. Code Components extracted from this document must
include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Kucherawy Standards Track [Page 1]
RFC 6008 Auth-Results Header.b Registration September 2010
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Keywords . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
3. Discussion . . . . . . . . . . . . . . . . . . . . . . . . . . 2
4. Definition . . . . . . . . . . . . . . . . . . . . . . . . . . 3
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 4
6. Security Considerations . . . . . . . . . . . . . . . . . . . . 4
6.1. Improvement . . . . . . . . . . . . . . . . . . . . . . . . 4
6.2. Result Forgeries . . . . . . . . . . . . . . . . . . . . . 4
6.3. New Schemes with Small Signatures . . . . . . . . . . . . . 4
7. References . . . . . . . . . . . . . . . . . . . . . . . . . . 5
7.1. Normative References . . . . . . . . . . . . . . . . . . . 5
7.2. Informative References . . . . . . . . . . . . . . . . . . 5
Appendix A. Authentication-Results Example . . . . . . . . . . . . 6
A.1. Multiple DKIM Signatures with One Failure . . . . . . . . . 6
Appendix B. Acknowledgements . . . . . . . . . . . . . . . . . . . 7
1. Introduction
[AUTHRES] defined a new header field for electronic mail messages
that presents the results of a message authentication effort in a
machine-readable format. Absent from that specification was the
means by which the results of two cryptographic signatures, such as
those provided by [DKIM], can both have results reported in an
unambiguous manner.
Fortunately, [AUTHRES] created IANA registries of reporting
properties, enabling an easy remedy for this problem. This memo thus
registers an additional reporting property allowing a result to be
associated with a specific digital signature.
2. Keywords
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in [KEYWORDS].
3. Discussion
A message can contain multiple signatures of a common sender
authentication mechanism, such as [DKIM]. For example, a DomainKeys
Identified Mail (DKIM) signer could apply signatures using two or
more different message canonicalization algorithms to determine the
resistance of each to being broken in transit.
Kucherawy Standards Track [Page 2]
RFC 6008 Auth-Results Header.b Registration September 2010
By applying supported "ptype.property" combinations (cf. the ABNF in
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